Topographic survey of Portugal at 1:50, 000 from the Instituto Geográfico Português, the country’s civilian survey organisation. The maps have contours at 25m intervals & in addition to the standard features shown on topographic mapping at this scale also indicate various types of vegetation (vineyards, olive groves, etc). Each sheet covers an area of 32 x 20km (20 x 12.5miles approx). The maps have latitude & longitude margin ticks at 1’ intervals & UTM coordinates for the map corners – each sheet also shows conversion details from BBLx (Bessel-Bonnie system, Datum Lisbon) to UTM. Map legend is in Portuguese only.EDITION DATES: most titles in this series have now been updated in the 1990s or later. To see all the titles in this series please click on the series link.